from flask import render_template, current_app, session, g, abort, request, jsonify

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route("/followed_user",methods=["POST"])
@user_login_data
def followed_user():
    """"关注或者取消关注用户"""

    # 0.取到自己的登录信息
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="未登录")

    # 1.取参数
    user_id = request.json.get("user_id")
    action = request.json.get("action")

    if not all([user_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # ２.判断参数
    if action not in ("follow", "unfollow"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # ３.取到要被关注的用户
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not other:
        return jsonify(errno=RET.NODATA, errmsg="未查询到数据")

    # ４.根据要执行的操作去修改对应的数据
    if action == "follow":
        if other not in user.followed:
            # 当前用户的关注列表添加另一个值
            user.followed.append(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户已被关注")
    else:
        # 取消关注
        if other in user.followed:
            user.followed.remove(other)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前用户未被关注")

    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blu.route('/comment_like', methods=["POST"])
@user_login_data
def set_comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not g.user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')

    # 1.取到请求参数
    comment_id = request.json.get("comment_id")
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    if not all([comment_id, news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ["add", "remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询评论数据
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询数据失败")

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论数据不存在")

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            # 增加点赞条数
            comment.like_count += 1
    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            # 减小点赞条数
            comment.like_count -= 1
    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库操作失败")

    return jsonify(errno=RET.OK, errmsg="OK")


@news_blu.route('/news_comment', methods=["POST"])
@user_login_data
def comment_news():
    """
    评论新闻或者回复某条新闻下指定的评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(error=RET.SESSIONERR, errmsg='用户为登录')

    # 1. 取到请求参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")

    # 2.判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(error=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(error=RET.NODATA, errmsg='未查到新闻数据')

    # 3.初始化一个评论模型，并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content

    if parent_id:
        comment.parent_id = parent_id

    # 4.添加到数据库
    # 为什么要自己去commit（），因为在return的时候需要用到commit的id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK, errmsg="评论成功", data=comment.to_dict())


@news_blu.route('/news_collect', methods=['POST'])
@user_login_data
def collect_news():
    """
    收藏新闻
    1.接收参数
    2.判断参数
    :return:
    """
    user = g.user
    if not user:
        return jsonify(error=RET.SESSIONERR, errmsg='用户为登录')

    # 1.接收参数
    news_id = request.json.get('news_id')
    action = request.json.get('action')

    # 2.判断参数
    if not all([news_id, action]):
        return jsonify(error=RET.PARAMERR, errmsg='参数错误')

    if action not in ['collect', 'cancel_collect']:
        return jsonify(error=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(error=RET.PARAMERR, errmsg='参数错误')

    # 3.查询新闻，并判断新闻是否存在
    news = None

    try:
        news = News.query.get(news_id)

    except Exception as e:
        current_app.logger.error(e)
        return jsonify(error=RET.DBERR, errmsg="数据查询错误")

    if not news:
        return jsonify(error=RET.NODATA, errmsg='未查到新闻数据')

    if action == 'cancel_collect':
        # 取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        # 收藏
        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)

    return jsonify(error=RET.OK, errmsg='操作成功')


@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :param news_id
    :return:
    """
    # 查询用户登录的信息
    user = g.user
    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    news_dict_li = []

    for news in news_list:
        news_dict_li.append((news.to_basic_dict()))

    # 查询新闻数据
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        # 报404错误，404错误统一显示后续再处理
        abort(404)

    # 更新新闻的点击次数
    news.clicks += 1

    # 是否是收藏
    is_collected = True

    if user:
        # 判断用户是否收藏当前新闻，如果被收藏
        # collection_news 后面可以不用加all，因为sqlalchemy会在使用的时候去自动加载
        if news in user.collection_news:
            is_collected = True

    # 去查询评论数据
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    comment_like_ids = []
    if g.user:
        try:
            # 需求：查询当前用户在当前新闻里面都点赞另哪些评论
            # 1.查询出当前新闻的所有评论（[COMMENT]）,取到所有的评论id[1,3,5,6]

            # 当前新闻 所有评论的id
            # comment_ids = [comment.id for comment in comments]
            comment_ids = [comment.id for comment in comments]
            # 2.再查询当前评论中哪些评论被当前用户所点赞（[CommentLike]），查询comment_id在第1步的评论id列表内的所有数据 & CommentList.user_id = g.user.id

            # CommentLike.user_id = g.user.id 当前用户点过的赞
            # CommentLike.comment_id.in_(comment_ids)当前新闻的评论被点赞了

            # + 法 当前新闻 当前用户 对哪些评论点过赞
            # 当前新闻 当前用户 对哪些评论点过赞 的评论id
            # 当前新闻        所有评论的id
            # 条件1 当前longue
            # 条件2 点在
            # 当前新闻 当前用户 点赞    的评论id
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == g.user.id).all()
            # 3.取到所有被点赞的评论id 第2步查询出来是一个[CommentLike]>>>>>[3,5]
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]  # >>>[3,5]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        # 代表没有点赞
        comment_dict["is_like"] = False
        # 判断当前遍历到的评论是否被当前登录用户所点赞
        if comment.id in comment_like_ids:
            comment_dict["is_like"] = True
        comment_dict_li.append(comment_dict)

    is_followed = False
    # if 当前新闻有作者,并且当前登录用户已关注过这个用户
    if news.user and user:
        # if user 是否关注过news.user
        if news.user in user.followed:
            is_followed = True

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "is_followed": is_followed,
        "comments": comment_dict_li
    }

    return render_template("news/detail.html", data=data)
